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    • 4. 发明专利
    • VACUUM VESSEL FOR NUCLEAR FUSION
    • JPH01270695A
    • 1989-10-27
    • JP9813788
    • 1988-04-22
    • HITACHI LTDJAPAN ATOMIC ENERGY RES INST
    • OWADA KOROYAMAMOTO MASAHIROARAI TAKASHIKODAMA KOZOAKINO NOBORUSUZUKI MICHIO
    • G21B1/11G21B1/00G21B1/17H05H1/12
    • PURPOSE:To protect an optical system equipments 2 from a molten metal powder of the first wall and to enable a cleaning work without removing instrumentation, by providing a cylinder to prevent flowing-in of an impurity into a lower port, making it protrude into a vacuum vessel from the upper end of the lower port. CONSTITUTION:The first wall 7 is fixed to an inner surface of a vacuum vessel 2 to protect the vessel 2 and also is subdivided into small parts to absorb a thermal stress derived from a radiation heating of a plasma 1. Therefore, a metal powder 8 of the first wall 7 melted by the plasma 1 reaches an opening of the lower port 4 via the inner surface of the vessel 2, from gaps in the first wall 7. In this occasion, in case that a cylinder 6 is fixed to the inner surface of the lower port 4, the metal powder of the first wall, dropping down along the inner surface of the vessel 2, is stopped by the cylinder 6 and does not fall into the lower port 4. Moreover, covering an upper end of the cylinder 6 with a lid when the inner surface of the vessel 2 is washed down makes it possible to wash the inner surface of the vessel 2 without removing an instrumentation from the lower port 4, and to prevent damage of the instrumentation by dropping dusts into the inside of the port during a rinsing work of a cleaner liquid.